I'm running a single steel shim on my street car. I bought a Cometic gasket & just used the outer layer since they have all the right embossing grooves on them.
I have done exactly this with iron heads and block but am a little scared to try it with aluminum heads butt that is exactly what I am contemplating right now (6.4 BGE with single layer from each head gasket to give a cheap compression and quench boost). I guess since the heads are not really that hard to swap on these I will probably just give it a shot and put regular ones back if I have a problem.
